Kawasaki NINJA ZX-7RR (1997-2003) [21/364] Technical information maintenance free battery

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GENERAL INFORMATION 1 13 Technical Information Maintenance Free Battery A maintenance free battery is installed in this model The maintenance free battery is a sealed type and so the electrolyte level check and toppinq up cannot be performed I Construction Sealing plug Filter Lid P P Safety valve Terminal lead calcium alloy Filler plug Pole lead calcium alloy Negative plate lead and lead calcium alloy Container P P Special separator Positive plate lead and lead calcium alloy II Main Features 1 Maintenance free 2 No electrolyte leakage 3 Instant activation system 4 One push motion electrolyte filling 5 Safety construction 6 Compact and high performance 7 Strong charge discharge characteristics It is not necessary to check the electrolyte level and top up the electrolyte As the electrolyte is retained firmly in the special separators there is no free electrolyte in the battery It can be used instantly after filling only the electrolyte without initial charge It is possible to fill the electrolyte by easy one push motion If the battery internal pressure rises abnormally high the safety valve opens to release the gas inside the battery to restore the normal pressure and prevent the battery from rupturing After restoring the normal pressure the safety valve closes and the battery is sealed again Moreover a ceramic filter is disposed on top of the safety valve under the lid to remove risk of ignition or explosion caused by fire from outside No presence of free electrolyte allows the battery made lower in height thus resulting in enhanced volume efficiency Moreover gas being absorbed inside the battery eliminates the need for a gas exhaust tube It can amply withstand deep charge discharge cycles Ill Principle of Sealing Structure A lead acid battery operates under the following chemical reaction Discharge PbO2 2H2SO4 Pb 7 Lead peroxide Sulfuric acid Spongy lead Charge Positive active Electrolyte Negative active material material PbSO4 2H2O PbSO4 Lead sulfate water Lead sulfate Positive active Electrolyte Negative active material material Normally in an ordinary lead acid battery when it comes to an end of a charge where the lead sulfate being a discharge product returns to lead peroxide and spongy lead the charge current flowing thereafter is used exclusively to decompose electrolytically water from the electrolyte thus resulting in generation of hydrogen gas from the negative plate and oxygen gas from the positive plate The gases so generated are released out of the battery causing the amount of electrolyte decreased to require occasional water replenishment A maintenance free battery however is so designed that when it is overcharged even if the positive plate is fully charged the negative plate remains not fully turned to spongy lead Therefore even when the positive plate is overcharged generating oxygen gas the negative plate is not fully charged hence generating no hydrogen gas Moreover the oxygen gas generated from the positive plate immediately reacts with the charged active material on the negative plate and returns to water with the ultimate result of no water loss

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